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1 1 54                           Appendix VI.

the water falls in a cool state to the bottom at o, while the -air
and steam proceed to the: outside jacket of the regenerator o,
.being thus further heated before entering the bottom, of the
producer A. The coal is distilled in the bell B in : charges -of
about 9 cwt., the products uniting with the producer gas; arid
the, heat is so great that the tar is changed to fixed hydrocarbons.
In fact, the real difficulty is to keep the heat down within
manageable limits, and this is effected by the supply of a great
quantity of steam, 2^ tons per ton of fuel, half a ton of which is
decomposed in the producer. The gas leaves the producer by
the interior pipe of the regenerator c, and is next washed in the
washer D by revolving splashers, taking a temperature of 194 F.,
and passing on to the ammonia tower H \ a small portion being
allowed to enter the air and steam pipe at s to still further lowei;
the producer temperature by dilution. The towers H and  . are
also fitted with tiles, and supplied with cold water from o.iby the
pump N, which delivers by the pump Q Q. Trickling through, H
the water becomes ammoniacal liquor in the tank j, from which
it is taken to the. sulphate plant, while that down, the cooling
tower. K becomes hot at the base L on account of its meeting hot
gas and receiving the latent heat of the excess steam. The cople.d
gas finally emerges at p on its way to the engine, but as there are
some traces of tar it is filtered through a box of. sawdust. The
composition of Mond gas on the average is 

     CO   ':..:.. iro
H   ...... 29*0

.    ;                    .   .    .   '   CH      ......       2-0..       '


XT                         c diluents

N    ...... 42*0

J                                                                100*0 parts by volume.

j                    shewing usefully CO and a large percentage of H.    One volume

|                     of gas is Burnt in the engine with 1-13 volumes of air, and the

I                    calorific value is 14$ B.T.U. per cub, ft.                   ;

I                          Blast-furnace Gas was formerly and is ,now mainly used to

evaporate water in steam boilers, the power being given to steam
engines for the blowing plant    Mr. B. H. Thwaite first pointed